Fuelab 51506-3-S-G 515 Series EFI Adjustable Fuel Pressure Regulator Green Anodized

The Fuelab 515 Series EFI Adjustable Fuel Pressure Regulator (51506-3-S-G) is a high-performance bypass-style fuel pressure regulator built from billet aluminum with a distinctive green anodized finish (MIL-A-8625, Type II). Engineered for EFI applications in the 25–90 PSI range, it accepts port-style and non-port-style union fittings without interference, offering exceptional installation flexibility for custom fuel systems.

The -6AN return port is located on the bottom of the regulator, while two -6AN inlet ports provide a clean, symmetrical plumbing layout. A fine thread pitch on the adjustment screw allows for precise pressure tuning, and the included 1/8" NPT gauge port lets you monitor fuel pressure with an external gauge. Compatible with gasoline, diesel, methanol, and ethanol, this regulator is a versatile choice for a wide range of performance builds.

Key Features:

• EFI pressure range: 25–90 PSI (standard seat)
• Two -6AN inlet ports and one -6AN return port (bottom-mounted)
• Accepts port-style and non-port-style union fittings
• Billet aluminum construction with green anodize per military MIL-A-8625, Type II
• Fine thread pitch adjustment for precise fuel pressure control
• 1/8" NPT gauge port with plug for external fuel pressure gauge
• 1/8" NPT vacuum/boost reference port with barbed fitting
• Compatible with gasoline, diesel, methanol, and ethanol
• Includes versatile mounting bracket and stainless steel hardware
• Backed by Fuelab's 2-year limited warranty

Sold individually. The Fuelab 515 Series is available in multiple configurations supporting pressures from 1 PSI (carbureted) up to 125 PSI (high-pressure EFI), making it one of the most adaptable adjustable fuel pressure regulators on the market.